just wondering, is there anything wrong with using round ports made of pvc piping? it is 50 times easier to get the proper length and tuning with round, so what are the negatives, and (if any) positives of using round ports???

thanks

JCivicHb

05-05-2005, 02:46 AM

whoops, forgot to add,2 round ports in a 5 cube box with a 12 inch solo x at 42 hz???

JimJ

05-05-2005, 02:47 AM

A possible negative is that you want to make sure you sand the edges of the port down to a smooth edge, so you can minimize port "chuffing".

Other than that, it's aesthetic preference.

JCivicHb

05-05-2005, 02:56 AM

yea i was thinking port noise would be about it.

also, would it matter how close two round ports were to each other??

JimJ

05-05-2005, 02:58 AM

Nope.

UndercoverPunk

05-05-2005, 02:58 AM

yea i was thinking port noise would be about it.

also, would it matter how close two round ports were to each other??

Slot ports are just as easy as round IMO, and it's WAY easier to have a ton of port area wit slot ports.

jujumantb

05-05-2005, 03:10 AM

Round are actually ideal for airflow

dkc62

05-05-2005, 04:17 AM

I've always wondered this myself.

JimJ

05-05-2005, 09:55 AM

Properly done, sonically there shouldn't be a difference between the two. It's whatever looks best and allows you to get the port parameters you want. Sometimes, having a round port allows you to play with the tuning until you get it exactly right, something that's difficult with a slot port. I designed my Fostex BR's with tube ports because the port length was very, very short - it would have been silly to use a slot port for that. However, my e12a box has a very long port length to drop the tuning to 27Hz, so a slot port was the natural way to go.

All depends on the app.

req

05-05-2005, 10:25 AM

basically, having a low tuned - subbass - SQ box is eaiser with a slot port because more often than not, around 1\2SD (rule of thumb to avoid port noise) and excessive lengths are what are nessicary.

its eaiser to bend a slot port than a tube port.

but in all technicallity - a very smooth round port is better than a slotted port because the circumfrence is smaller, and there is less 'drag' on the surface of the port and the air moves at closer speeds at the center and the edges.

but really i doubt you will be able to notice a difference when listning to subbass if there is no port noise :p:

hookdupexpo

05-18-2005, 06:50 PM

I like the idea of being able to switch the ports with a round port so that you can get a different tuning. But port noise can be a ***** if you dont do it right

InhumanAcura

05-18-2005, 06:56 PM

i prefer round ports..slot ports are a pain in the *** to mess with the tuning..